diff --git a/doc/reference/ubuntu-image.rst b/doc/reference/ubuntu-image.rst
index 70c6f768..c09fea94 100644
--- a/doc/reference/ubuntu-image.rst
+++ b/doc/reference/ubuntu-image.rst
@@ -39,6 +39,7 @@ Basic syntax
 
     ubuntu-image classic [options] image_definition.yaml
 
+.. note:: ``ubuntu-image`` requires **elevated permissions**. Please be sure to run it as **root** or with ``sudo``.
 
 General options
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